Bank of Japan Mounts Bold Bid for Revival

TOKYO—New Bank of Japan Gov. Haruhiko Kuroda quickly and dramatically put his stamp on the long-beleaguered central bank, implanting a policy grand in substance and simple in presentation—a stark contrast with his predecessor, who favored incremental steps, emphasizing the complexity and the risks.

Using placards with bright red print to explain the complex package of new policies, Mr. Kuroda boiled it all down to the number two: 2%...